热变形条件及热处理参数对SA-508Gr.3钢的影响  

Effect of Thermal Deformation and Heat Treatment Parameters on SA-508Cr.3 Steel

作　　者：王浩强 赵玲玲 刘凯泉 

机构地区：[1]天津重型装备工程研究有限公司,工程师天津300457

出　　处：《一重技术》2017年第5期44-47,共4页CFHI Technology

摘　　要：通过热压缩实验,分析不同变形条件(温度范围1 200~700℃,变形速率范围0.001~1 s^(-1))对晶粒尺寸的影响。得到的试验结果表明,变形温度为1 100℃、应变速率为1 s^(-1)时,再结晶细化晶粒的作用最好,晶粒度可以达到5级。通过选取3种不同变形程度的试样进行860℃退火热处理,发现均可以获得细小均匀的晶粒,晶粒度均达到8级。而随着奥氏体化温度的提高(920℃、960℃、980℃、1 000℃)晶粒度会发生长大,在980℃以下经过奥氏体化,晶粒尺寸均大于4级,而当温度高于1 000℃以后,晶粒尺寸迅速增大,达到2级。Hot compression tests were performed to analyze the effect of different deformation conditions（at temperature of1 200 ℃ to 700 ℃ and strain rate of 0.001 ~ 1 s^（-1））） on the grain size. The test result reveals that recrystallization can work best to refine grains to the grade 5 at deformation temperature 1100 ℃ and strain rate 1 s^（-1））. It is found that three test pieces with different deformation degrees subject to annealing heat treatment at 860 ℃ has fine and uniform grains with grain size up to the grade 8. The grain become bigger with the increase of austenitizing temperature to 920 ℃, 960 ℃, 980 ℃ and 1 000 ℃.The grain size is fine better than the grade 4 when the grains were austenitized below 980 ℃. But the grains become bigger rapidly and the size reaches the grade 2 when the austenitizing temperature is higher than 1 000 ℃.

关 键 词：晶粒细化 热变形 SA-508Gr.3钢 微观组织 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG15[金属学及工艺—金属材料]